# A Formatting Language similar to BOX described in
#  [vandenbrand1996a] and [dejonge2003a]
#
module Rockit
  module PrettyPrint
    module Box
      # An element of the Box language
      class Term
      end

      # H formats its elements horizontally with a given number of spaces
      # in between.
      class H < Term
	attr_reader :num_hdelims, :elements

	def initialize(numHorizontalDelims = 1, *elements)
	  @num_hdelims = numHdelims
	  @elements = elements
	end
      end

      # H formats its elements horizontally with a given number of spaces
      # in between.
      class V < Term
	attr_reader :elements

	def initialize(*elements)
	  @elements = elements
	end
      end

      # Epsilon is a H operator with no spaces in between
      class Epsilon < H
	def initialize(*elements)
	  super(0, *elements)
	end
      end
    end
  end
end

require 'rockit/prettyprint/text_renderer'

# We must do the def's below after requiring the text_renderer
# since there is a circular dependency between the definitions.
module Rockit
  module PrettyPrint
    module Box
      class Term
	def render
	  render_on(Box::TextRenderer.new)
	end

	def render_on(renderer)
	  renderer.render(self)
	end
      end
    end
  end
end